This article has an erratum: [https://doi.org/10.1051/0004-6361/201732216e]
Measured wind velocities for IK Tau (as determined from the half-line width at zero intensity) versus half of the spatial FWHM sFWHM (representing the dominant line formation region). Unblended lines are indicated with a diamond, (minor) blended lines with a grey squared box. The velocity profile deduced by Decin et al. (2010b) is shown in magenta (dashed-triple dotted line), by Velilla Prieto et al. (2017) in blue (dotted line), and a blind fit to the unblended data for a fixed stochastic velocity of 1.5 km s−1 (Decin et al. 2010b) in red (dashed-dotted line).
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